Filtering device for fin type heat exchanger

Abstract

The utility model relates to the technical field of filtering devices, and discloses a filtering device for a fin type heat exchanger. The filter pipe is communicated with the base pipe, and a filter unit used for filtering liquid flowing through the filter pipe is arranged in the filter pipe; cleaning liquid is introduced into the back-flushing assembly, and the back-flushing assembly is communicated with the filter pipe and used for flushing the side, close to the liquid inlet end of the filter pipe, of the filter unit and discharging flushed impurities out of the filter pipe; and the control assembly is used for controlling the backflushing assembly to regularly clean the filtering unit. The filtering device has the effect that impurities attached to the filtering device can be conveniently cleaned.

Description

Technical Field

[0001] This application relates to the technical field of filtration devices, and particularly to a filtration device for a finned heat exchanger. Background Art

[0002] A finned heat exchanger is an efficient heat exchange device, widely used in various industrial and civil fields, such as chemical industry, petroleum, electric power, air-conditioning refrigeration, automotive cooling systems, etc. It increases the heat exchange area by adding fins on the surface of the heat exchange tubes or heat exchange plates, thereby improving the heat exchange efficiency.

[0003] In order to reduce impurities in the liquid flowing inside the finned heat exchanger, the finned heat exchanger is usually filtered through a filtration device.

[0004] After the existing filtration device filters the liquid flowing through the pipeline, the filtered impurities are likely to accumulate inside the filtration device. As the filtered impurities continue to accumulate, the filtration effect of the filtration device may decline, affecting its performance. Summary of the Utility Model

[0005] In order to facilitate the cleaning of impurities attached to the filtration device, this application provides a filtration device for a finned heat exchanger.

[0006] The filtration device for a finned heat exchanger provided by this application adopts the following technical solutions:

[0007] A filtration device for a finned heat exchanger, comprising:

[0008] A base pipe;

[0009] A filter pipe, communicating with the base pipe, and a filtration unit for filtering the liquid flowing through the filter pipe is installed inside the filter pipe;

[0010] A backwashing assembly, with a cleaning liquid introduced therein, communicating with the filter pipe, for flushing the side of the filtration unit close to the liquid inlet end of the filter pipe and discharging the flushed impurities out of the filter pipe;

[0011] A control assembly, for controlling the backwashing assembly to clean the filtration unit regularly;

[0012] When the filtration unit is working, the control assembly regularly makes the cleaning liquid flush the impurities attached to the filtration unit along the direction from the liquid outlet end to the liquid inlet end of the filter pipe through the backwashing assembly, and discharges the impurities out of the filter pipe.

[0013] Optionally, the backwashing assembly includes:

[0014] A backflush pipe, with the liquid inlet end and the liquid outlet end of the backflush pipe both communicating with the filter pipe, and the filter unit being located between the liquid inlet end and the liquid outlet end of the backflush pipe;

[0015] A drain pipe, with the liquid inlet end of the drain pipe communicating with the filter pipe, and the liquid inlet end of the drain pipe being located between the filter unit and the liquid inlet end of the backflush pipe;

[0016] A control part, used for controlling the liquid flow direction;

[0017] When the backflush assembly works, the control part controls the liquid inside the filter pipe to flow back into the filter pipe from inside the backflush pipe, flushes the filter unit, and discharges impurities from the drain pipe; when the backflush assembly stops working, the control part controls the liquid to directly flow from the filter pipe into the base pipe.

[0018] Optionally, the control part includes:

[0019] A first control valve, installed on the filter pipe and located between the liquid inlet end of the backflush pipe and the drain pipe;

[0020] A second control valve, installed on the filter pipe and located between the liquid outlet end of the backflush pipe and the liquid outlet end of the drain pipe;

[0021] A third control valve, installed on the backflush pipe;

[0022] A fourth control valve, installed on the drain pipe;

[0023] When the backflush assembly works, the first control valve and the second control valve are opened, and the third control valve and the fourth control valve are closed; when the backflush assembly stops working, the first control valve and the second control valve are closed, and the third control valve and the fourth control valve are opened.

[0024] Optionally, the filter unit includes:

[0025] An installation ring, hermetically installed inside the filter pipe;

[0026] A filter screen, installed on the inner circumferential wall of the installation ring and used for filtering the flowing-through liquid.

[0027] Optionally, a plurality of diversion grooves are circumferentially formed on the side wall of the installation ring along the axial direction of the installation ring, and the depth of the diversion grooves gradually increases in the direction from far away from the filter screen to close to the filter screen.

[0028] Optionally, the filter unit further includes:

[0029] The diversion ring is installed between the installation ring and the filter net, and an arc surface for diverting liquid is provided on the diversion ring.

[0030] Optionally, the inner wall of the inner circle of the diversion ring is threadedly connected to the installation ring.

[0031] Optionally, there are two diversion rings, and the two diversion rings clamp and fix the filter net.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. When the filter net is normally filtering the heat-exchanging liquid, the first control valve and the second control valve are opened through the control assembly, and the third control valve and the fourth control valve are closed. The heat-exchanging liquid directly flows from the filter pipe into the inner part of the base pipe.

[0034] When it is necessary to clean the impurities on the filter net, the first control valve and the second control valve are closed through the control assembly, and the third control valve and the fourth control valve are opened. The heat-exchanging liquid flows from the filter pipe into the backflush pipe, and the heat-exchanging liquid is made to flow through the filter net in the direction from the liquid outlet end of the filter pipe to the liquid inlet end of the filter pipe, so as to wash the impurities attached to the filter net, and the washed and dropped impurities are discharged from the drain pipe to the outside of the filter pipe, thereby completing the cleaning of the filter net. During the flow of the heat-exchanging liquid, the diversion groove and the arc surface cooperate with each other to divert the heat-exchanging liquid to the filter net, improving the filtering efficiency of the filter net and the efficiency of cleaning the impurities on the filter net.

[0035] When installing the filter net, the filter net is directly clamped by two diversion rings, improving the convenience of installing the filter net. Description of the Drawings

[0036] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0037] Figure 2 It is a schematic diagram showing the positional relationship between the backflush assembly and the filter pipe in an embodiment of the present application.

[0038] Figure 3 It is a schematic diagram showing the structure of the filter unit in an embodiment of the present application.

[0039] Figure 4 It is a schematic diagram showing the positional relationship between the filter net and the diversion ring in an embodiment of the present application.

[0040] Description of the Reference Numerals

[0041] 1. Base tube; 2. Filter tube; 21. Filter unit; 22. Installation ring; 23. Filter net; 24. Flow guide ring; 25. Flow guide groove; 3. Backflush assembly; 31. Backflush tube; 32. Drain pipe; 33. Control part; 34. First control valve; 35. Second control valve; 36. Third control valve; 37. Fourth control valve. Detailed implementation mode

[0042] The following is a further detailed description of this application in conjunction with the attached Figures 1 - 4 drawings.

[0043] The embodiment of this application discloses a filtering device for a finned heat exchanger.

[0044] A filtering device for a finned heat exchanger includes a base tube 1, a filter tube 2, a backflush assembly 3 and a control assembly. The base tube 1 and the filter tube 2 are connected in communication. A filter unit 21 is installed inside the backflush assembly 3. The backflush assembly 3 is installed on the filter tube 2. The control assembly is electrically connected to the backflush assembly 3.

[0045] The liquid for heat exchange flows into the interior of the base tube 1 from the filter tube 2. When the liquid for heat exchange flows through the filter tube 2, the filter unit 21 inside the filter tube 2 filters the liquid for heat exchange. During the operation of the filter unit 21, the backflush assembly 3 is periodically controlled by the control assembly to flush the filter unit 21, thereby reducing the impurities attached to the filter unit 21 and discharging the impurities from the filter tube 2, and prolonging the service life of the filter unit 21.

[0046] The control assembly is a processor electrically connected to the backflush assembly 3.

[0047] The backflush assembly 3 includes a backflush tube 31, a drain pipe 32 and a control part 33.

[0048] The backflush tube 31 is arranged in a U shape, and both ends of the backflush tube 31 are connected in communication with the filter tube 2. The liquid inlet end of the drain pipe 32 is connected in communication with the filter tube 2, and the drain pipe 32 is located between both ends of the backflush tube 31. The control part 33 is used to control the flow direction of the liquid for heat exchange inside the filter tube 2.

[0049] The control part 33 includes a first control valve 34, a second control valve 35, a third control valve 36 and a fourth control valve 37. Both the first control valve 34 and the second control valve 35 are installed on the filter tube 2. The first control valve 34 is located at a position close to the liquid inlet end of the filter tube 2, and the second control valve 35 is located at a position close to the liquid outlet end of the filter tube 2.

[0050] The first control valve 34 is located between the liquid inlet end of the backflush tube 31 and the liquid inlet end of the drain pipe 32. The second control valve 35 is located between the liquid outlet end of the backflush tube 31 and the liquid outlet end of the filter tube 2. The third control valve 36 is installed on the backflush tube 31, and the fourth control valve 37 is installed on the drain pipe 32.

[0051] When the filtering unit 21 is normally filtering the heat-exchanged liquid, the first control valve 34 and the second control valve 35 are opened through the control assembly, and the third control valve 36 and the fourth control valve 37 are closed. The heat-exchanged liquid directly flows from the filter tube 2 into the inner part of the base tube 1.

[0052] When impurities on the filtering unit 21 need to be cleaned, the first control valve 34 and the second control valve 35 are closed through the control assembly, and the third control valve 36 and the fourth control valve 37 are opened.

[0053] The heat-exchanged liquid flows from the filter tube 2 into the backflush tube 31, and the heat-exchanged liquid is made to flow through the filtering unit 21 in the direction from the liquid outlet end of the filter tube 2 to the liquid inlet end of the filter tube 2, so as to wash the impurities attached to the filtering unit 21, and the washed-off impurities are discharged from the drain pipe 32 to the outside of the filter tube 2, thereby completing the cleaning of the filtering unit 21.

[0054] The filtering unit 21 is cleaned by changing the flow direction of the heat-exchanged liquid, which improves the convenience of cleaning the filtering unit 21.

[0055] The filtering unit 21 includes a mounting ring 22, a filter screen 23 and a guide ring 24. The mounting ring 22 is coaxial with the filter tube 2, and the mounting ring 22 is fixedly sealed on the inner wall of the filter tube 2. Both the filter screen 23 and the guide ring 24 are placed on the inner circumferential wall of the mounting ring 22. There are two guide rings 24. The two guide rings 24 are coaxial with the filter tube 2, and the two guide rings 24 clamp the filter screen 23. Each guide ring 24 is threadedly connected to the inner circumferential wall of the mounting ring 22.

[0056] When installing the filter screen 23, first install one guide ring 24 on the mounting ring 22, then make the filter screen 23 contact the guide ring 24, and then install the other guide ring 24. The filter screen 23 is clamped and fixed by the two guide rings 24, thereby improving the convenience of installing the filter screen 23.

[0057] In order to facilitate guiding the heat-exchanged liquid to the filter screen 23, a plurality of guide grooves 25 are circumferentially formed on the side wall of the mounting ring 22 along the axial direction of the mounting ring 22. The depth of the guide grooves 25 gradually increases in the direction from far away from the filter screen 23 to close to the filter screen 23. An arc surface for guiding the liquid is formed on the guide ring 24.

[0058] When the heat-exchanged liquid flows inside the filter tube 2, the guide grooves 25 and the arc surface cooperate to guide the heat-exchanged liquid to the filter screen 23. Thus, the filtering efficiency of the filter screen 23 is improved, and at the same time, the convenience of cleaning the impurities attached to the filter screen 23 is also improved.

[0059] The implementation principle of a filtering device for a fin - type heat exchanger in an embodiment of the present application is as follows: When the filter screen 23 is normally filtering the heat - exchanging liquid, the first control valve 34 and the second control valve 35 are opened through the control assembly, and the third control valve 36 and the fourth control valve 37 are closed. The heat - exchanging liquid directly flows into the inner part of the base pipe 1 from the filter pipe 2.

[0060] When it is necessary to clean the impurities on the filter screen 23, the first control valve 34 and the second control valve 35 are closed through the control assembly, and the third control valve 36 and the fourth control valve 37 are opened. The heat - exchanging liquid flows from the filter pipe 2 into the back - flushing pipe 31, and the heat - exchanging liquid flows through the filter screen 23 in the direction from the liquid outlet end of the filter pipe 2 to the liquid inlet end of the filter pipe 2, so as to wash the impurities attached to the filter screen 23, and discharge the washed - off impurities from the drain pipe 32 to the outside of the filter pipe 2, thereby completing the cleaning of the filter screen 23. During the flow of the heat - exchanging liquid, the guide groove 25 and the arc surface cooperate with each other to guide the heat - exchanging liquid to the filter screen 23, improving the filtering efficiency of the filter screen 23 and the efficiency of cleaning the impurities on the filter screen 23.

[0061] When installing the filter screen 23, the filter screen 23 is directly clamped by two guide rings 24, improving the convenience of installing the filter screen 23.

[0062] The above are all preferred embodiments of the present application. It does not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A filtering device for a finned heat exchanger, characterized in that: Comprising: A base pipe (1); A filter pipe (2), which is communicated with the base pipe (1), and a filter unit (21) for filtering the liquid flowing through the filter pipe (2) is installed inside the filter pipe (2); A backflush assembly (3), with a cleaning liquid introduced therein, which is communicated with the filter pipe (2) and is used for flushing the side of the filter unit (21) close to the liquid inlet end of the filter pipe (2) and discharging the impurities after flushing from the filter pipe (2); A control assembly, which is used for controlling the backflush assembly (3) to clean the filter unit (21) regularly; When the filter unit (21) is working, the control assembly regularly makes the cleaning liquid flush the impurities attached to the filter unit (21) in the direction from the liquid outlet end of the filter pipe (2) to the liquid inlet end of the filter pipe (2) through the backflush assembly (3) and discharges the impurities from the filter pipe (2).

2. The filter device for a finned heat exchanger according to claim 1, wherein: The backflush assembly (3) includes: A backflush pipe (31), the liquid inlet end and the liquid outlet end of the backflush pipe (31) are both communicated with the filter pipe (2), and the filter unit (21) is located between the liquid inlet end and the liquid outlet end of the backflush pipe (31); A drain pipe (32), the liquid inlet end of the drain pipe (32) is communicated with the filter pipe (2), and the liquid inlet end of the drain pipe (32) is located between the filter unit (21) and the liquid inlet end of the backflush pipe (31); A control part (33), which is used for controlling the liquid flow direction; When the backflush assembly (3) is working, the control part (33) controls the liquid inside the filter pipe (2) to flow back into the filter pipe (2) from inside the backflush pipe (31), flushes the filter unit (21), and discharges the impurities from the drain pipe (32); when the backflush assembly (3) stops working, the control part (33) controls the liquid to directly flow from the filter pipe (2) into the base pipe (1) inside.

3. The filter device for a finned heat exchanger according to claim 2, wherein: The control part (33) includes: A first control valve (34), which is installed on the filter pipe (2) and is located between the liquid inlet end of the backflush pipe (31) and the liquid inlet end of the drain pipe (32); A second control valve (35), which is installed on the filter pipe (2) and is located between the liquid outlet end of the backflush pipe (31) and the liquid outlet end of the drain pipe (32); A third control valve (36), the third control valve (36) is installed on the backflush pipe (31); A fourth control valve (37), which is installed on the drain pipe (32); When the backflush assembly (3) is working, the first control valve (34) and the second control valve (35) are opened, and the third control valve (36) and the fourth control valve (37) are closed; when the backflush assembly (3) stops working, the first control valve (34) and the second control valve (35) are closed, and the third control valve (36) and the fourth control valve (37) are opened.

4. The filtering device for a fin - type heat exchanger according to claim 1, wherein: The filtering unit (21) includes: A mounting ring (22), which is hermetically installed on the inner part of the filter tube (2); A filter net (23), which is installed on the inner circumferential wall of the mounting ring (22) and is used for filtering the flowing - through liquid.

5. The filtering device for a fin - type heat exchanger according to claim 4, wherein: A plurality of diversion grooves (25) are circumferentially formed on the side wall of the mounting ring (22) along the axial direction of the mounting ring (22), and the depth of the diversion grooves (25) gradually increases in the direction from far away from the filter net (23) to close to the filter net (23).

6. The filtering device for a fin - type heat exchanger according to claim 4, wherein: The filtering unit (21) further includes: A diversion ring (24), which is installed between the mounting ring (22) and the filter net (23), and an arc surface for guiding the liquid is formed on the diversion ring (24).

7. The filtering device for a fin - type heat exchanger according to claim 6, wherein: The diversion ring (24) is threadedly connected to the inner circumferential wall of the mounting ring (22).

8. The filtering device for a fin - type heat exchanger according to claim 6, wherein: There are two diversion rings (24), and the two diversion rings (24) clamp and fix the filter net (23).

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